Stop using WebCore namespace in generated code

Source/build/scripts/templates/RuntimeEnabledFeatures.h.tmpl

 {% from 'macros.tmpl' import license %}
 {{license()}}
 
 #ifndef RuntimeEnabledFeatures_h
 #define RuntimeEnabledFeatures_h
 
 #include "platform/PlatformExport.h"
 
-namespace WebCore {
+namespace blink {
 
 // A class that stores static enablers for all experimental features.
 
 class PLATFORM_EXPORT RuntimeEnabledFeatures {
 public:
     {% for feature_set in feature_sets %}
     static void set{{feature_set|capitalize}}FeaturesEnabled(bool);
     {% endfor %}
 
 
@@ skipping 19 matching lines @@
 private:
     RuntimeEnabledFeatures() { }
 
     {% for feature in features if not feature.custom %}
     {% filter enable_conditional(feature.condition) %}
     static bool is{{feature.name}}Enabled;
     {% endfilter %}
     {% endfor %}
 };
 
-} // namespace WebCore
+} // namespace blink
 
 #endif // RuntimeEnabledFeatures_h